mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-13 19:56:41 +07:00
0fae3bf018
If a device is renamed and the original name is subsequently reused
for a new device, the following warning is generated:
sysctl duplicate entry: /net/mpls/conf/veth0//input
CPU: 3 PID: 1379 Comm: ip Not tainted 4.1.0-rc4+ #20
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.7.5-20140531_083030-gandalf 04/01/2014
0000000000000000 0000000000000000 ffffffff81566aaf 0000000000000000
ffffffff81236279 ffff88002f7d7f00 0000000000000000 ffff88000db336d8
ffff88000db33698 0000000000000005 ffff88002e046000 ffff8800168c9280
Call Trace:
[<ffffffff81566aaf>] ? dump_stack+0x40/0x50
[<ffffffff81236279>] ? __register_sysctl_table+0x289/0x5a0
[<ffffffffa051a24f>] ? mpls_dev_notify+0x1ff/0x300 [mpls_router]
[<ffffffff8108db7f>] ? notifier_call_chain+0x4f/0x70
[<ffffffff81470e72>] ? register_netdevice+0x2b2/0x480
[<ffffffffa0524748>] ? veth_newlink+0x178/0x2d3 [veth]
[<ffffffff8147f84c>] ? rtnl_newlink+0x73c/0x8e0
[<ffffffff8147f27a>] ? rtnl_newlink+0x16a/0x8e0
[<ffffffff81459ff2>] ? __kmalloc_reserve.isra.30+0x32/0x90
[<ffffffff8147ccfd>] ? rtnetlink_rcv_msg+0x8d/0x250
[<ffffffff8145b027>] ? __alloc_skb+0x47/0x1f0
[<ffffffff8149badb>] ? __netlink_lookup+0xab/0xe0
[<ffffffff8147cc70>] ? rtnetlink_rcv+0x30/0x30
[<ffffffff8149e7a0>] ? netlink_rcv_skb+0xb0/0xd0
[<ffffffff8147cc64>] ? rtnetlink_rcv+0x24/0x30
[<ffffffff8149df17>] ? netlink_unicast+0x107/0x1a0
[<ffffffff8149e4be>] ? netlink_sendmsg+0x50e/0x630
[<ffffffff8145209c>] ? sock_sendmsg+0x3c/0x50
[<ffffffff81452beb>] ? ___sys_sendmsg+0x27b/0x290
[<ffffffff811bd258>] ? mem_cgroup_try_charge+0x88/0x110
[<ffffffff811bd5b6>] ? mem_cgroup_commit_charge+0x56/0xa0
[<ffffffff811d7700>] ? do_filp_open+0x30/0xa0
[<ffffffff8145336e>] ? __sys_sendmsg+0x3e/0x80
[<ffffffff8156c3f2>] ? system_call_fastpath+0x16/0x75
Fix this by unregistering the previous sysctl table (registered for
the path containing the original device name) and re-registering the
table for the path containing the new device name.
Fixes: 37bde79979
("mpls: Per-device enabling of packet input")
Reported-by: Scott Feldman <sfeldma@gmail.com>
Signed-off-by: Robert Shearman <rshearma@brocade.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
1154 lines
27 KiB
C
1154 lines
27 KiB
C
#include <linux/types.h>
|
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#include <linux/skbuff.h>
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#include <linux/socket.h>
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#include <linux/sysctl.h>
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#include <linux/net.h>
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#include <linux/module.h>
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#include <linux/if_arp.h>
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#include <linux/ipv6.h>
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#include <linux/mpls.h>
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#include <linux/vmalloc.h>
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#include <net/ip.h>
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#include <net/dst.h>
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#include <net/sock.h>
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#include <net/arp.h>
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#include <net/ip_fib.h>
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#include <net/netevent.h>
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#include <net/netns/generic.h>
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#include "internal.h"
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#define LABEL_NOT_SPECIFIED (1<<20)
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#define MAX_NEW_LABELS 2
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/* This maximum ha length copied from the definition of struct neighbour */
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#define MAX_VIA_ALEN (ALIGN(MAX_ADDR_LEN, sizeof(unsigned long)))
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struct mpls_route { /* next hop label forwarding entry */
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struct net_device __rcu *rt_dev;
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struct rcu_head rt_rcu;
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u32 rt_label[MAX_NEW_LABELS];
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u8 rt_protocol; /* routing protocol that set this entry */
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u8 rt_labels;
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u8 rt_via_alen;
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u8 rt_via_table;
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u8 rt_via[0];
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};
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static int zero = 0;
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static int label_limit = (1 << 20) - 1;
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static void rtmsg_lfib(int event, u32 label, struct mpls_route *rt,
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struct nlmsghdr *nlh, struct net *net, u32 portid,
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unsigned int nlm_flags);
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static struct mpls_route *mpls_route_input_rcu(struct net *net, unsigned index)
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{
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struct mpls_route *rt = NULL;
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if (index < net->mpls.platform_labels) {
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struct mpls_route __rcu **platform_label =
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rcu_dereference(net->mpls.platform_label);
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rt = rcu_dereference(platform_label[index]);
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}
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return rt;
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}
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static inline struct mpls_dev *mpls_dev_get(const struct net_device *dev)
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{
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return rcu_dereference_rtnl(dev->mpls_ptr);
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}
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static bool mpls_output_possible(const struct net_device *dev)
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{
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return dev && (dev->flags & IFF_UP) && netif_carrier_ok(dev);
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}
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static unsigned int mpls_rt_header_size(const struct mpls_route *rt)
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{
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/* The size of the layer 2.5 labels to be added for this route */
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return rt->rt_labels * sizeof(struct mpls_shim_hdr);
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}
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static unsigned int mpls_dev_mtu(const struct net_device *dev)
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{
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/* The amount of data the layer 2 frame can hold */
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return dev->mtu;
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}
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static bool mpls_pkt_too_big(const struct sk_buff *skb, unsigned int mtu)
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{
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if (skb->len <= mtu)
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return false;
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if (skb_is_gso(skb) && skb_gso_network_seglen(skb) <= mtu)
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return false;
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return true;
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}
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static bool mpls_egress(struct mpls_route *rt, struct sk_buff *skb,
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struct mpls_entry_decoded dec)
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{
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/* RFC4385 and RFC5586 encode other packets in mpls such that
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* they don't conflict with the ip version number, making
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* decoding by examining the ip version correct in everything
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* except for the strangest cases.
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*
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* The strange cases if we choose to support them will require
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* manual configuration.
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*/
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struct iphdr *hdr4;
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bool success = true;
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/* The IPv4 code below accesses through the IPv4 header
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* checksum, which is 12 bytes into the packet.
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* The IPv6 code below accesses through the IPv6 hop limit
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* which is 8 bytes into the packet.
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*
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* For all supported cases there should always be at least 12
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* bytes of packet data present. The IPv4 header is 20 bytes
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* without options and the IPv6 header is always 40 bytes
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* long.
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*/
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if (!pskb_may_pull(skb, 12))
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return false;
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/* Use ip_hdr to find the ip protocol version */
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hdr4 = ip_hdr(skb);
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if (hdr4->version == 4) {
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skb->protocol = htons(ETH_P_IP);
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csum_replace2(&hdr4->check,
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htons(hdr4->ttl << 8),
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htons(dec.ttl << 8));
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hdr4->ttl = dec.ttl;
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}
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else if (hdr4->version == 6) {
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struct ipv6hdr *hdr6 = ipv6_hdr(skb);
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skb->protocol = htons(ETH_P_IPV6);
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hdr6->hop_limit = dec.ttl;
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}
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else
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/* version 0 and version 1 are used by pseudo wires */
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success = false;
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return success;
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}
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static int mpls_forward(struct sk_buff *skb, struct net_device *dev,
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struct packet_type *pt, struct net_device *orig_dev)
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{
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struct net *net = dev_net(dev);
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struct mpls_shim_hdr *hdr;
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struct mpls_route *rt;
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struct mpls_entry_decoded dec;
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struct net_device *out_dev;
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struct mpls_dev *mdev;
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unsigned int hh_len;
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unsigned int new_header_size;
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unsigned int mtu;
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int err;
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/* Careful this entire function runs inside of an rcu critical section */
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mdev = mpls_dev_get(dev);
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if (!mdev || !mdev->input_enabled)
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goto drop;
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if (skb->pkt_type != PACKET_HOST)
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goto drop;
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if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
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goto drop;
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if (!pskb_may_pull(skb, sizeof(*hdr)))
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goto drop;
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/* Read and decode the label */
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hdr = mpls_hdr(skb);
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dec = mpls_entry_decode(hdr);
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/* Pop the label */
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skb_pull(skb, sizeof(*hdr));
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skb_reset_network_header(skb);
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skb_orphan(skb);
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rt = mpls_route_input_rcu(net, dec.label);
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if (!rt)
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goto drop;
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/* Find the output device */
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out_dev = rcu_dereference(rt->rt_dev);
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if (!mpls_output_possible(out_dev))
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goto drop;
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if (skb_warn_if_lro(skb))
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goto drop;
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skb_forward_csum(skb);
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/* Verify ttl is valid */
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if (dec.ttl <= 1)
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goto drop;
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dec.ttl -= 1;
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/* Verify the destination can hold the packet */
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new_header_size = mpls_rt_header_size(rt);
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mtu = mpls_dev_mtu(out_dev);
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if (mpls_pkt_too_big(skb, mtu - new_header_size))
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goto drop;
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hh_len = LL_RESERVED_SPACE(out_dev);
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if (!out_dev->header_ops)
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hh_len = 0;
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/* Ensure there is enough space for the headers in the skb */
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if (skb_cow(skb, hh_len + new_header_size))
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goto drop;
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skb->dev = out_dev;
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skb->protocol = htons(ETH_P_MPLS_UC);
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if (unlikely(!new_header_size && dec.bos)) {
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/* Penultimate hop popping */
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if (!mpls_egress(rt, skb, dec))
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goto drop;
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} else {
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bool bos;
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int i;
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skb_push(skb, new_header_size);
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skb_reset_network_header(skb);
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/* Push the new labels */
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hdr = mpls_hdr(skb);
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bos = dec.bos;
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for (i = rt->rt_labels - 1; i >= 0; i--) {
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hdr[i] = mpls_entry_encode(rt->rt_label[i], dec.ttl, 0, bos);
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bos = false;
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}
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}
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err = neigh_xmit(rt->rt_via_table, out_dev, rt->rt_via, skb);
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if (err)
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net_dbg_ratelimited("%s: packet transmission failed: %d\n",
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__func__, err);
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return 0;
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drop:
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kfree_skb(skb);
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return NET_RX_DROP;
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}
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static struct packet_type mpls_packet_type __read_mostly = {
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.type = cpu_to_be16(ETH_P_MPLS_UC),
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.func = mpls_forward,
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};
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static const struct nla_policy rtm_mpls_policy[RTA_MAX+1] = {
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[RTA_DST] = { .type = NLA_U32 },
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[RTA_OIF] = { .type = NLA_U32 },
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};
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struct mpls_route_config {
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u32 rc_protocol;
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u32 rc_ifindex;
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u16 rc_via_table;
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u16 rc_via_alen;
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u8 rc_via[MAX_VIA_ALEN];
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u32 rc_label;
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u32 rc_output_labels;
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u32 rc_output_label[MAX_NEW_LABELS];
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u32 rc_nlflags;
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struct nl_info rc_nlinfo;
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};
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static struct mpls_route *mpls_rt_alloc(size_t alen)
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{
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struct mpls_route *rt;
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rt = kzalloc(sizeof(*rt) + alen, GFP_KERNEL);
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if (rt)
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rt->rt_via_alen = alen;
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return rt;
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}
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static void mpls_rt_free(struct mpls_route *rt)
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{
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if (rt)
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kfree_rcu(rt, rt_rcu);
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}
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static void mpls_notify_route(struct net *net, unsigned index,
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struct mpls_route *old, struct mpls_route *new,
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const struct nl_info *info)
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{
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struct nlmsghdr *nlh = info ? info->nlh : NULL;
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unsigned portid = info ? info->portid : 0;
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int event = new ? RTM_NEWROUTE : RTM_DELROUTE;
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struct mpls_route *rt = new ? new : old;
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unsigned nlm_flags = (old && new) ? NLM_F_REPLACE : 0;
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/* Ignore reserved labels for now */
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if (rt && (index >= 16))
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rtmsg_lfib(event, index, rt, nlh, net, portid, nlm_flags);
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}
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static void mpls_route_update(struct net *net, unsigned index,
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struct net_device *dev, struct mpls_route *new,
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const struct nl_info *info)
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{
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struct mpls_route __rcu **platform_label;
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struct mpls_route *rt, *old = NULL;
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ASSERT_RTNL();
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platform_label = rtnl_dereference(net->mpls.platform_label);
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rt = rtnl_dereference(platform_label[index]);
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if (!dev || (rt && (rtnl_dereference(rt->rt_dev) == dev))) {
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rcu_assign_pointer(platform_label[index], new);
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old = rt;
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}
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mpls_notify_route(net, index, old, new, info);
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|
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/* If we removed a route free it now */
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mpls_rt_free(old);
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}
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static unsigned find_free_label(struct net *net)
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{
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struct mpls_route __rcu **platform_label;
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size_t platform_labels;
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unsigned index;
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platform_label = rtnl_dereference(net->mpls.platform_label);
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platform_labels = net->mpls.platform_labels;
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for (index = 16; index < platform_labels; index++) {
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if (!rtnl_dereference(platform_label[index]))
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return index;
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}
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return LABEL_NOT_SPECIFIED;
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|
}
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static int mpls_route_add(struct mpls_route_config *cfg)
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{
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struct mpls_route __rcu **platform_label;
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struct net *net = cfg->rc_nlinfo.nl_net;
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struct net_device *dev = NULL;
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struct mpls_route *rt, *old;
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unsigned index;
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int i;
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int err = -EINVAL;
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|
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index = cfg->rc_label;
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|
|
|
/* If a label was not specified during insert pick one */
|
|
if ((index == LABEL_NOT_SPECIFIED) &&
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(cfg->rc_nlflags & NLM_F_CREATE)) {
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index = find_free_label(net);
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}
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|
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/* The first 16 labels are reserved, and may not be set */
|
|
if (index < 16)
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goto errout;
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|
|
/* The full 20 bit range may not be supported. */
|
|
if (index >= net->mpls.platform_labels)
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|
goto errout;
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|
|
/* Ensure only a supported number of labels are present */
|
|
if (cfg->rc_output_labels > MAX_NEW_LABELS)
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goto errout;
|
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|
|
err = -ENODEV;
|
|
dev = dev_get_by_index(net, cfg->rc_ifindex);
|
|
if (!dev)
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|
goto errout;
|
|
|
|
/* Ensure this is a supported device */
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|
err = -EINVAL;
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|
if (!mpls_dev_get(dev))
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goto errout;
|
|
|
|
err = -EINVAL;
|
|
if ((cfg->rc_via_table == NEIGH_LINK_TABLE) &&
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(dev->addr_len != cfg->rc_via_alen))
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goto errout;
|
|
|
|
/* Append makes no sense with mpls */
|
|
err = -EOPNOTSUPP;
|
|
if (cfg->rc_nlflags & NLM_F_APPEND)
|
|
goto errout;
|
|
|
|
err = -EEXIST;
|
|
platform_label = rtnl_dereference(net->mpls.platform_label);
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|
old = rtnl_dereference(platform_label[index]);
|
|
if ((cfg->rc_nlflags & NLM_F_EXCL) && old)
|
|
goto errout;
|
|
|
|
err = -EEXIST;
|
|
if (!(cfg->rc_nlflags & NLM_F_REPLACE) && old)
|
|
goto errout;
|
|
|
|
err = -ENOENT;
|
|
if (!(cfg->rc_nlflags & NLM_F_CREATE) && !old)
|
|
goto errout;
|
|
|
|
err = -ENOMEM;
|
|
rt = mpls_rt_alloc(cfg->rc_via_alen);
|
|
if (!rt)
|
|
goto errout;
|
|
|
|
rt->rt_labels = cfg->rc_output_labels;
|
|
for (i = 0; i < rt->rt_labels; i++)
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rt->rt_label[i] = cfg->rc_output_label[i];
|
|
rt->rt_protocol = cfg->rc_protocol;
|
|
RCU_INIT_POINTER(rt->rt_dev, dev);
|
|
rt->rt_via_table = cfg->rc_via_table;
|
|
memcpy(rt->rt_via, cfg->rc_via, cfg->rc_via_alen);
|
|
|
|
mpls_route_update(net, index, NULL, rt, &cfg->rc_nlinfo);
|
|
|
|
dev_put(dev);
|
|
return 0;
|
|
|
|
errout:
|
|
if (dev)
|
|
dev_put(dev);
|
|
return err;
|
|
}
|
|
|
|
static int mpls_route_del(struct mpls_route_config *cfg)
|
|
{
|
|
struct net *net = cfg->rc_nlinfo.nl_net;
|
|
unsigned index;
|
|
int err = -EINVAL;
|
|
|
|
index = cfg->rc_label;
|
|
|
|
/* The first 16 labels are reserved, and may not be removed */
|
|
if (index < 16)
|
|
goto errout;
|
|
|
|
/* The full 20 bit range may not be supported */
|
|
if (index >= net->mpls.platform_labels)
|
|
goto errout;
|
|
|
|
mpls_route_update(net, index, NULL, NULL, &cfg->rc_nlinfo);
|
|
|
|
err = 0;
|
|
errout:
|
|
return err;
|
|
}
|
|
|
|
#define MPLS_PERDEV_SYSCTL_OFFSET(field) \
|
|
(&((struct mpls_dev *)0)->field)
|
|
|
|
static const struct ctl_table mpls_dev_table[] = {
|
|
{
|
|
.procname = "input",
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec,
|
|
.data = MPLS_PERDEV_SYSCTL_OFFSET(input_enabled),
|
|
},
|
|
{ }
|
|
};
|
|
|
|
static int mpls_dev_sysctl_register(struct net_device *dev,
|
|
struct mpls_dev *mdev)
|
|
{
|
|
char path[sizeof("net/mpls/conf/") + IFNAMSIZ];
|
|
struct ctl_table *table;
|
|
int i;
|
|
|
|
table = kmemdup(&mpls_dev_table, sizeof(mpls_dev_table), GFP_KERNEL);
|
|
if (!table)
|
|
goto out;
|
|
|
|
/* Table data contains only offsets relative to the base of
|
|
* the mdev at this point, so make them absolute.
|
|
*/
|
|
for (i = 0; i < ARRAY_SIZE(mpls_dev_table); i++)
|
|
table[i].data = (char *)mdev + (uintptr_t)table[i].data;
|
|
|
|
snprintf(path, sizeof(path), "net/mpls/conf/%s", dev->name);
|
|
|
|
mdev->sysctl = register_net_sysctl(dev_net(dev), path, table);
|
|
if (!mdev->sysctl)
|
|
goto free;
|
|
|
|
return 0;
|
|
|
|
free:
|
|
kfree(table);
|
|
out:
|
|
return -ENOBUFS;
|
|
}
|
|
|
|
static void mpls_dev_sysctl_unregister(struct mpls_dev *mdev)
|
|
{
|
|
struct ctl_table *table;
|
|
|
|
table = mdev->sysctl->ctl_table_arg;
|
|
unregister_net_sysctl_table(mdev->sysctl);
|
|
kfree(table);
|
|
}
|
|
|
|
static struct mpls_dev *mpls_add_dev(struct net_device *dev)
|
|
{
|
|
struct mpls_dev *mdev;
|
|
int err = -ENOMEM;
|
|
|
|
ASSERT_RTNL();
|
|
|
|
mdev = kzalloc(sizeof(*mdev), GFP_KERNEL);
|
|
if (!mdev)
|
|
return ERR_PTR(err);
|
|
|
|
err = mpls_dev_sysctl_register(dev, mdev);
|
|
if (err)
|
|
goto free;
|
|
|
|
rcu_assign_pointer(dev->mpls_ptr, mdev);
|
|
|
|
return mdev;
|
|
|
|
free:
|
|
kfree(mdev);
|
|
return ERR_PTR(err);
|
|
}
|
|
|
|
static void mpls_ifdown(struct net_device *dev)
|
|
{
|
|
struct mpls_route __rcu **platform_label;
|
|
struct net *net = dev_net(dev);
|
|
struct mpls_dev *mdev;
|
|
unsigned index;
|
|
|
|
platform_label = rtnl_dereference(net->mpls.platform_label);
|
|
for (index = 0; index < net->mpls.platform_labels; index++) {
|
|
struct mpls_route *rt = rtnl_dereference(platform_label[index]);
|
|
if (!rt)
|
|
continue;
|
|
if (rtnl_dereference(rt->rt_dev) != dev)
|
|
continue;
|
|
rt->rt_dev = NULL;
|
|
}
|
|
|
|
mdev = mpls_dev_get(dev);
|
|
if (!mdev)
|
|
return;
|
|
|
|
mpls_dev_sysctl_unregister(mdev);
|
|
|
|
RCU_INIT_POINTER(dev->mpls_ptr, NULL);
|
|
|
|
kfree_rcu(mdev, rcu);
|
|
}
|
|
|
|
static int mpls_dev_notify(struct notifier_block *this, unsigned long event,
|
|
void *ptr)
|
|
{
|
|
struct net_device *dev = netdev_notifier_info_to_dev(ptr);
|
|
struct mpls_dev *mdev;
|
|
|
|
switch(event) {
|
|
case NETDEV_REGISTER:
|
|
/* For now just support ethernet devices */
|
|
if ((dev->type == ARPHRD_ETHER) ||
|
|
(dev->type == ARPHRD_LOOPBACK)) {
|
|
mdev = mpls_add_dev(dev);
|
|
if (IS_ERR(mdev))
|
|
return notifier_from_errno(PTR_ERR(mdev));
|
|
}
|
|
break;
|
|
|
|
case NETDEV_UNREGISTER:
|
|
mpls_ifdown(dev);
|
|
break;
|
|
case NETDEV_CHANGENAME:
|
|
mdev = mpls_dev_get(dev);
|
|
if (mdev) {
|
|
int err;
|
|
|
|
mpls_dev_sysctl_unregister(mdev);
|
|
err = mpls_dev_sysctl_register(dev, mdev);
|
|
if (err)
|
|
return notifier_from_errno(err);
|
|
}
|
|
break;
|
|
}
|
|
return NOTIFY_OK;
|
|
}
|
|
|
|
static struct notifier_block mpls_dev_notifier = {
|
|
.notifier_call = mpls_dev_notify,
|
|
};
|
|
|
|
static int nla_put_via(struct sk_buff *skb,
|
|
u8 table, const void *addr, int alen)
|
|
{
|
|
static const int table_to_family[NEIGH_NR_TABLES + 1] = {
|
|
AF_INET, AF_INET6, AF_DECnet, AF_PACKET,
|
|
};
|
|
struct nlattr *nla;
|
|
struct rtvia *via;
|
|
int family = AF_UNSPEC;
|
|
|
|
nla = nla_reserve(skb, RTA_VIA, alen + 2);
|
|
if (!nla)
|
|
return -EMSGSIZE;
|
|
|
|
if (table <= NEIGH_NR_TABLES)
|
|
family = table_to_family[table];
|
|
|
|
via = nla_data(nla);
|
|
via->rtvia_family = family;
|
|
memcpy(via->rtvia_addr, addr, alen);
|
|
return 0;
|
|
}
|
|
|
|
int nla_put_labels(struct sk_buff *skb, int attrtype,
|
|
u8 labels, const u32 label[])
|
|
{
|
|
struct nlattr *nla;
|
|
struct mpls_shim_hdr *nla_label;
|
|
bool bos;
|
|
int i;
|
|
nla = nla_reserve(skb, attrtype, labels*4);
|
|
if (!nla)
|
|
return -EMSGSIZE;
|
|
|
|
nla_label = nla_data(nla);
|
|
bos = true;
|
|
for (i = labels - 1; i >= 0; i--) {
|
|
nla_label[i] = mpls_entry_encode(label[i], 0, 0, bos);
|
|
bos = false;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int nla_get_labels(const struct nlattr *nla,
|
|
u32 max_labels, u32 *labels, u32 label[])
|
|
{
|
|
unsigned len = nla_len(nla);
|
|
unsigned nla_labels;
|
|
struct mpls_shim_hdr *nla_label;
|
|
bool bos;
|
|
int i;
|
|
|
|
/* len needs to be an even multiple of 4 (the label size) */
|
|
if (len & 3)
|
|
return -EINVAL;
|
|
|
|
/* Limit the number of new labels allowed */
|
|
nla_labels = len/4;
|
|
if (nla_labels > max_labels)
|
|
return -EINVAL;
|
|
|
|
nla_label = nla_data(nla);
|
|
bos = true;
|
|
for (i = nla_labels - 1; i >= 0; i--, bos = false) {
|
|
struct mpls_entry_decoded dec;
|
|
dec = mpls_entry_decode(nla_label + i);
|
|
|
|
/* Ensure the bottom of stack flag is properly set
|
|
* and ttl and tc are both clear.
|
|
*/
|
|
if ((dec.bos != bos) || dec.ttl || dec.tc)
|
|
return -EINVAL;
|
|
|
|
switch (dec.label) {
|
|
case MPLS_LABEL_IMPLNULL:
|
|
/* RFC3032: This is a label that an LSR may
|
|
* assign and distribute, but which never
|
|
* actually appears in the encapsulation.
|
|
*/
|
|
return -EINVAL;
|
|
}
|
|
|
|
label[i] = dec.label;
|
|
}
|
|
*labels = nla_labels;
|
|
return 0;
|
|
}
|
|
|
|
static int rtm_to_route_config(struct sk_buff *skb, struct nlmsghdr *nlh,
|
|
struct mpls_route_config *cfg)
|
|
{
|
|
struct rtmsg *rtm;
|
|
struct nlattr *tb[RTA_MAX+1];
|
|
int index;
|
|
int err;
|
|
|
|
err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_mpls_policy);
|
|
if (err < 0)
|
|
goto errout;
|
|
|
|
err = -EINVAL;
|
|
rtm = nlmsg_data(nlh);
|
|
memset(cfg, 0, sizeof(*cfg));
|
|
|
|
if (rtm->rtm_family != AF_MPLS)
|
|
goto errout;
|
|
if (rtm->rtm_dst_len != 20)
|
|
goto errout;
|
|
if (rtm->rtm_src_len != 0)
|
|
goto errout;
|
|
if (rtm->rtm_tos != 0)
|
|
goto errout;
|
|
if (rtm->rtm_table != RT_TABLE_MAIN)
|
|
goto errout;
|
|
/* Any value is acceptable for rtm_protocol */
|
|
|
|
/* As mpls uses destination specific addresses
|
|
* (or source specific address in the case of multicast)
|
|
* all addresses have universal scope.
|
|
*/
|
|
if (rtm->rtm_scope != RT_SCOPE_UNIVERSE)
|
|
goto errout;
|
|
if (rtm->rtm_type != RTN_UNICAST)
|
|
goto errout;
|
|
if (rtm->rtm_flags != 0)
|
|
goto errout;
|
|
|
|
cfg->rc_label = LABEL_NOT_SPECIFIED;
|
|
cfg->rc_protocol = rtm->rtm_protocol;
|
|
cfg->rc_nlflags = nlh->nlmsg_flags;
|
|
cfg->rc_nlinfo.portid = NETLINK_CB(skb).portid;
|
|
cfg->rc_nlinfo.nlh = nlh;
|
|
cfg->rc_nlinfo.nl_net = sock_net(skb->sk);
|
|
|
|
for (index = 0; index <= RTA_MAX; index++) {
|
|
struct nlattr *nla = tb[index];
|
|
if (!nla)
|
|
continue;
|
|
|
|
switch(index) {
|
|
case RTA_OIF:
|
|
cfg->rc_ifindex = nla_get_u32(nla);
|
|
break;
|
|
case RTA_NEWDST:
|
|
if (nla_get_labels(nla, MAX_NEW_LABELS,
|
|
&cfg->rc_output_labels,
|
|
cfg->rc_output_label))
|
|
goto errout;
|
|
break;
|
|
case RTA_DST:
|
|
{
|
|
u32 label_count;
|
|
if (nla_get_labels(nla, 1, &label_count,
|
|
&cfg->rc_label))
|
|
goto errout;
|
|
|
|
/* The first 16 labels are reserved, and may not be set */
|
|
if (cfg->rc_label < 16)
|
|
goto errout;
|
|
|
|
break;
|
|
}
|
|
case RTA_VIA:
|
|
{
|
|
struct rtvia *via = nla_data(nla);
|
|
if (nla_len(nla) < offsetof(struct rtvia, rtvia_addr))
|
|
goto errout;
|
|
cfg->rc_via_alen = nla_len(nla) -
|
|
offsetof(struct rtvia, rtvia_addr);
|
|
if (cfg->rc_via_alen > MAX_VIA_ALEN)
|
|
goto errout;
|
|
|
|
/* Validate the address family */
|
|
switch(via->rtvia_family) {
|
|
case AF_PACKET:
|
|
cfg->rc_via_table = NEIGH_LINK_TABLE;
|
|
break;
|
|
case AF_INET:
|
|
cfg->rc_via_table = NEIGH_ARP_TABLE;
|
|
if (cfg->rc_via_alen != 4)
|
|
goto errout;
|
|
break;
|
|
case AF_INET6:
|
|
cfg->rc_via_table = NEIGH_ND_TABLE;
|
|
if (cfg->rc_via_alen != 16)
|
|
goto errout;
|
|
break;
|
|
default:
|
|
/* Unsupported address family */
|
|
goto errout;
|
|
}
|
|
|
|
memcpy(cfg->rc_via, via->rtvia_addr, cfg->rc_via_alen);
|
|
break;
|
|
}
|
|
default:
|
|
/* Unsupported attribute */
|
|
goto errout;
|
|
}
|
|
}
|
|
|
|
err = 0;
|
|
errout:
|
|
return err;
|
|
}
|
|
|
|
static int mpls_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh)
|
|
{
|
|
struct mpls_route_config cfg;
|
|
int err;
|
|
|
|
err = rtm_to_route_config(skb, nlh, &cfg);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
return mpls_route_del(&cfg);
|
|
}
|
|
|
|
|
|
static int mpls_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh)
|
|
{
|
|
struct mpls_route_config cfg;
|
|
int err;
|
|
|
|
err = rtm_to_route_config(skb, nlh, &cfg);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
return mpls_route_add(&cfg);
|
|
}
|
|
|
|
static int mpls_dump_route(struct sk_buff *skb, u32 portid, u32 seq, int event,
|
|
u32 label, struct mpls_route *rt, int flags)
|
|
{
|
|
struct net_device *dev;
|
|
struct nlmsghdr *nlh;
|
|
struct rtmsg *rtm;
|
|
|
|
nlh = nlmsg_put(skb, portid, seq, event, sizeof(*rtm), flags);
|
|
if (nlh == NULL)
|
|
return -EMSGSIZE;
|
|
|
|
rtm = nlmsg_data(nlh);
|
|
rtm->rtm_family = AF_MPLS;
|
|
rtm->rtm_dst_len = 20;
|
|
rtm->rtm_src_len = 0;
|
|
rtm->rtm_tos = 0;
|
|
rtm->rtm_table = RT_TABLE_MAIN;
|
|
rtm->rtm_protocol = rt->rt_protocol;
|
|
rtm->rtm_scope = RT_SCOPE_UNIVERSE;
|
|
rtm->rtm_type = RTN_UNICAST;
|
|
rtm->rtm_flags = 0;
|
|
|
|
if (rt->rt_labels &&
|
|
nla_put_labels(skb, RTA_NEWDST, rt->rt_labels, rt->rt_label))
|
|
goto nla_put_failure;
|
|
if (nla_put_via(skb, rt->rt_via_table, rt->rt_via, rt->rt_via_alen))
|
|
goto nla_put_failure;
|
|
dev = rtnl_dereference(rt->rt_dev);
|
|
if (dev && nla_put_u32(skb, RTA_OIF, dev->ifindex))
|
|
goto nla_put_failure;
|
|
if (nla_put_labels(skb, RTA_DST, 1, &label))
|
|
goto nla_put_failure;
|
|
|
|
nlmsg_end(skb, nlh);
|
|
return 0;
|
|
|
|
nla_put_failure:
|
|
nlmsg_cancel(skb, nlh);
|
|
return -EMSGSIZE;
|
|
}
|
|
|
|
static int mpls_dump_routes(struct sk_buff *skb, struct netlink_callback *cb)
|
|
{
|
|
struct net *net = sock_net(skb->sk);
|
|
struct mpls_route __rcu **platform_label;
|
|
size_t platform_labels;
|
|
unsigned int index;
|
|
|
|
ASSERT_RTNL();
|
|
|
|
index = cb->args[0];
|
|
if (index < 16)
|
|
index = 16;
|
|
|
|
platform_label = rtnl_dereference(net->mpls.platform_label);
|
|
platform_labels = net->mpls.platform_labels;
|
|
for (; index < platform_labels; index++) {
|
|
struct mpls_route *rt;
|
|
rt = rtnl_dereference(platform_label[index]);
|
|
if (!rt)
|
|
continue;
|
|
|
|
if (mpls_dump_route(skb, NETLINK_CB(cb->skb).portid,
|
|
cb->nlh->nlmsg_seq, RTM_NEWROUTE,
|
|
index, rt, NLM_F_MULTI) < 0)
|
|
break;
|
|
}
|
|
cb->args[0] = index;
|
|
|
|
return skb->len;
|
|
}
|
|
|
|
static inline size_t lfib_nlmsg_size(struct mpls_route *rt)
|
|
{
|
|
size_t payload =
|
|
NLMSG_ALIGN(sizeof(struct rtmsg))
|
|
+ nla_total_size(2 + rt->rt_via_alen) /* RTA_VIA */
|
|
+ nla_total_size(4); /* RTA_DST */
|
|
if (rt->rt_labels) /* RTA_NEWDST */
|
|
payload += nla_total_size(rt->rt_labels * 4);
|
|
if (rt->rt_dev) /* RTA_OIF */
|
|
payload += nla_total_size(4);
|
|
return payload;
|
|
}
|
|
|
|
static void rtmsg_lfib(int event, u32 label, struct mpls_route *rt,
|
|
struct nlmsghdr *nlh, struct net *net, u32 portid,
|
|
unsigned int nlm_flags)
|
|
{
|
|
struct sk_buff *skb;
|
|
u32 seq = nlh ? nlh->nlmsg_seq : 0;
|
|
int err = -ENOBUFS;
|
|
|
|
skb = nlmsg_new(lfib_nlmsg_size(rt), GFP_KERNEL);
|
|
if (skb == NULL)
|
|
goto errout;
|
|
|
|
err = mpls_dump_route(skb, portid, seq, event, label, rt, nlm_flags);
|
|
if (err < 0) {
|
|
/* -EMSGSIZE implies BUG in lfib_nlmsg_size */
|
|
WARN_ON(err == -EMSGSIZE);
|
|
kfree_skb(skb);
|
|
goto errout;
|
|
}
|
|
rtnl_notify(skb, net, portid, RTNLGRP_MPLS_ROUTE, nlh, GFP_KERNEL);
|
|
|
|
return;
|
|
errout:
|
|
if (err < 0)
|
|
rtnl_set_sk_err(net, RTNLGRP_MPLS_ROUTE, err);
|
|
}
|
|
|
|
static int resize_platform_label_table(struct net *net, size_t limit)
|
|
{
|
|
size_t size = sizeof(struct mpls_route *) * limit;
|
|
size_t old_limit;
|
|
size_t cp_size;
|
|
struct mpls_route __rcu **labels = NULL, **old;
|
|
struct mpls_route *rt0 = NULL, *rt2 = NULL;
|
|
unsigned index;
|
|
|
|
if (size) {
|
|
labels = kzalloc(size, GFP_KERNEL | __GFP_NOWARN | __GFP_NORETRY);
|
|
if (!labels)
|
|
labels = vzalloc(size);
|
|
|
|
if (!labels)
|
|
goto nolabels;
|
|
}
|
|
|
|
/* In case the predefined labels need to be populated */
|
|
if (limit > MPLS_LABEL_IPV4NULL) {
|
|
struct net_device *lo = net->loopback_dev;
|
|
rt0 = mpls_rt_alloc(lo->addr_len);
|
|
if (!rt0)
|
|
goto nort0;
|
|
RCU_INIT_POINTER(rt0->rt_dev, lo);
|
|
rt0->rt_protocol = RTPROT_KERNEL;
|
|
rt0->rt_via_table = NEIGH_LINK_TABLE;
|
|
memcpy(rt0->rt_via, lo->dev_addr, lo->addr_len);
|
|
}
|
|
if (limit > MPLS_LABEL_IPV6NULL) {
|
|
struct net_device *lo = net->loopback_dev;
|
|
rt2 = mpls_rt_alloc(lo->addr_len);
|
|
if (!rt2)
|
|
goto nort2;
|
|
RCU_INIT_POINTER(rt2->rt_dev, lo);
|
|
rt2->rt_protocol = RTPROT_KERNEL;
|
|
rt2->rt_via_table = NEIGH_LINK_TABLE;
|
|
memcpy(rt2->rt_via, lo->dev_addr, lo->addr_len);
|
|
}
|
|
|
|
rtnl_lock();
|
|
/* Remember the original table */
|
|
old = rtnl_dereference(net->mpls.platform_label);
|
|
old_limit = net->mpls.platform_labels;
|
|
|
|
/* Free any labels beyond the new table */
|
|
for (index = limit; index < old_limit; index++)
|
|
mpls_route_update(net, index, NULL, NULL, NULL);
|
|
|
|
/* Copy over the old labels */
|
|
cp_size = size;
|
|
if (old_limit < limit)
|
|
cp_size = old_limit * sizeof(struct mpls_route *);
|
|
|
|
memcpy(labels, old, cp_size);
|
|
|
|
/* If needed set the predefined labels */
|
|
if ((old_limit <= MPLS_LABEL_IPV6NULL) &&
|
|
(limit > MPLS_LABEL_IPV6NULL)) {
|
|
RCU_INIT_POINTER(labels[MPLS_LABEL_IPV6NULL], rt2);
|
|
rt2 = NULL;
|
|
}
|
|
|
|
if ((old_limit <= MPLS_LABEL_IPV4NULL) &&
|
|
(limit > MPLS_LABEL_IPV4NULL)) {
|
|
RCU_INIT_POINTER(labels[MPLS_LABEL_IPV4NULL], rt0);
|
|
rt0 = NULL;
|
|
}
|
|
|
|
/* Update the global pointers */
|
|
net->mpls.platform_labels = limit;
|
|
rcu_assign_pointer(net->mpls.platform_label, labels);
|
|
|
|
rtnl_unlock();
|
|
|
|
mpls_rt_free(rt2);
|
|
mpls_rt_free(rt0);
|
|
|
|
if (old) {
|
|
synchronize_rcu();
|
|
kvfree(old);
|
|
}
|
|
return 0;
|
|
|
|
nort2:
|
|
mpls_rt_free(rt0);
|
|
nort0:
|
|
kvfree(labels);
|
|
nolabels:
|
|
return -ENOMEM;
|
|
}
|
|
|
|
static int mpls_platform_labels(struct ctl_table *table, int write,
|
|
void __user *buffer, size_t *lenp, loff_t *ppos)
|
|
{
|
|
struct net *net = table->data;
|
|
int platform_labels = net->mpls.platform_labels;
|
|
int ret;
|
|
struct ctl_table tmp = {
|
|
.procname = table->procname,
|
|
.data = &platform_labels,
|
|
.maxlen = sizeof(int),
|
|
.mode = table->mode,
|
|
.extra1 = &zero,
|
|
.extra2 = &label_limit,
|
|
};
|
|
|
|
ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
|
|
|
|
if (write && ret == 0)
|
|
ret = resize_platform_label_table(net, platform_labels);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static const struct ctl_table mpls_table[] = {
|
|
{
|
|
.procname = "platform_labels",
|
|
.data = NULL,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = mpls_platform_labels,
|
|
},
|
|
{ }
|
|
};
|
|
|
|
static int mpls_net_init(struct net *net)
|
|
{
|
|
struct ctl_table *table;
|
|
|
|
net->mpls.platform_labels = 0;
|
|
net->mpls.platform_label = NULL;
|
|
|
|
table = kmemdup(mpls_table, sizeof(mpls_table), GFP_KERNEL);
|
|
if (table == NULL)
|
|
return -ENOMEM;
|
|
|
|
table[0].data = net;
|
|
net->mpls.ctl = register_net_sysctl(net, "net/mpls", table);
|
|
if (net->mpls.ctl == NULL)
|
|
return -ENOMEM;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void mpls_net_exit(struct net *net)
|
|
{
|
|
struct mpls_route __rcu **platform_label;
|
|
size_t platform_labels;
|
|
struct ctl_table *table;
|
|
unsigned int index;
|
|
|
|
table = net->mpls.ctl->ctl_table_arg;
|
|
unregister_net_sysctl_table(net->mpls.ctl);
|
|
kfree(table);
|
|
|
|
/* An rcu grace period has passed since there was a device in
|
|
* the network namespace (and thus the last in flight packet)
|
|
* left this network namespace. This is because
|
|
* unregister_netdevice_many and netdev_run_todo has completed
|
|
* for each network device that was in this network namespace.
|
|
*
|
|
* As such no additional rcu synchronization is necessary when
|
|
* freeing the platform_label table.
|
|
*/
|
|
rtnl_lock();
|
|
platform_label = rtnl_dereference(net->mpls.platform_label);
|
|
platform_labels = net->mpls.platform_labels;
|
|
for (index = 0; index < platform_labels; index++) {
|
|
struct mpls_route *rt = rtnl_dereference(platform_label[index]);
|
|
RCU_INIT_POINTER(platform_label[index], NULL);
|
|
mpls_rt_free(rt);
|
|
}
|
|
rtnl_unlock();
|
|
|
|
kvfree(platform_label);
|
|
}
|
|
|
|
static struct pernet_operations mpls_net_ops = {
|
|
.init = mpls_net_init,
|
|
.exit = mpls_net_exit,
|
|
};
|
|
|
|
static int __init mpls_init(void)
|
|
{
|
|
int err;
|
|
|
|
BUILD_BUG_ON(sizeof(struct mpls_shim_hdr) != 4);
|
|
|
|
err = register_pernet_subsys(&mpls_net_ops);
|
|
if (err)
|
|
goto out;
|
|
|
|
err = register_netdevice_notifier(&mpls_dev_notifier);
|
|
if (err)
|
|
goto out_unregister_pernet;
|
|
|
|
dev_add_pack(&mpls_packet_type);
|
|
|
|
rtnl_register(PF_MPLS, RTM_NEWROUTE, mpls_rtm_newroute, NULL, NULL);
|
|
rtnl_register(PF_MPLS, RTM_DELROUTE, mpls_rtm_delroute, NULL, NULL);
|
|
rtnl_register(PF_MPLS, RTM_GETROUTE, NULL, mpls_dump_routes, NULL);
|
|
err = 0;
|
|
out:
|
|
return err;
|
|
|
|
out_unregister_pernet:
|
|
unregister_pernet_subsys(&mpls_net_ops);
|
|
goto out;
|
|
}
|
|
module_init(mpls_init);
|
|
|
|
static void __exit mpls_exit(void)
|
|
{
|
|
rtnl_unregister_all(PF_MPLS);
|
|
dev_remove_pack(&mpls_packet_type);
|
|
unregister_netdevice_notifier(&mpls_dev_notifier);
|
|
unregister_pernet_subsys(&mpls_net_ops);
|
|
}
|
|
module_exit(mpls_exit);
|
|
|
|
MODULE_DESCRIPTION("MultiProtocol Label Switching");
|
|
MODULE_LICENSE("GPL v2");
|
|
MODULE_ALIAS_NETPROTO(PF_MPLS);
|